Instrument the project virtualenv

Instrument the isolated project venv with pinned pandas so a run records enough structure to debug offline: counts, latency if relevant, pass/fail of which python points inside .venv, and a stable stage name. Redact secrets and raw credentials from every event.

source .venv/bin/activate
python -m pip freeze | tee requirements.lock.txt | wc -l

Expected evidence: lockfile line count. Prefer JSON or structured text you can grep in CI over prose logs for python-virtual-environments.

Turn one historical failure—especially pip installing into the system Python—into a test that fails if the signal disappears for the project virtualenv. Observability without a failing test is optional decoration; observability with a test is part of the python-virtual-environments artifact.

Draft a three-field event for the project virtualenv: stage, ok, and one domain field derived from which python points inside .venv; importlib.metadata.version('pandas') matches pin. Add fixture_id or docs_version when content can change. Explicitly list fields that must never appear (tokens, passwords, raw prompts) because pip installing from an unpinned URL or committing .venv with credentials is in scope for this lab.

Wire one assertion that fails if the project virtualenv event is missing after a run. Observability that cannot fail a test will not survive contact with a busy python-virtual-environments repository.

Imagine a teammate opens only your event stream after a bad deploy. Could they tell whether project dir lab-env/ with requirements.txt containing pandas==2.2.2 was wrong, whether pip installing into the system Python, or activating the wrong venv returned, or whether pip installing from an unpinned URL or committing .venv with credentials slipped through? If not, rename fields until those three stories are distinguishable.

At the testing and observability stage for python-virtual-environments, the job is narrower than finishing a product demo. You are creating one progressive evidence piece about project dir lab-env/ with requirements.txt containing pandas==2.2.2 that later pages inherit without redefining success. Keep that fixture small enough to inspect by hand, keep outputs copy-pasteable as text, and refuse to narrate this baseline as if it were a production SLA: record global site-packages pandas version (or absence) before creating the venv.

For this page specifically, success looks like a structured event schema locked by a test while still centering the user decision to install project packages without mutating the global interpreter. If you cannot point to a file, command, or assertion that proves that for the project virtualenv, stay on this page instead of advancing.

Set up a virtual environment

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